[Lazarus] When All compiler options filtered views be unreadeable

[FreeMan]

fpc r29988 lazarus r47975 svn build on osx qt x64

When enter filter on, project options --> compiler options -->other --> 
All option's form, viewing be in screenshot.
Attention to checkbox is focused, under -CD text. After clean filter, 
views not change, still unreadable. After close form and re open, view 
is normal.


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